Added code to print to file with -tok input and created header file

runner.c

@@ -1,20 +1,24 @@
-#define ALPHA_OFFSET 5
-#define TOK_LEN 3
-#define INVALID_ARG "invalid"
-#define DIFF_ARG "diff"
-#include <string.h>
-
-int main(int argc, char* argv);
-char *is_tok(int argc, char* argv);
+#include "runner.h"
 
 
 int main(int argc, char *argv[]) {
     char *check_input;
-
+    int token;
     //check_input can be compared to INVALID_ARG and DIFF_ARG to determine if -tok and holds the generated file name if it is
     check_input = is_tok(argc, argv);
+    FILE * output = fopen(check_input, "w");
 
-    return 0; //not sure what to do yet
+    if (check_input == INVALID_ARG) {
+        return -1;
+    }
+    
+    while (0 != (token = yylex())) {
+        if (check_input != DIFF_ARG) {
+            fprintf(output, "%d %d %3d \"%s\"\n", line_number, column_number, token, yytext);
+        }        
+    }
+
+    return 0;
 }
 
 char *is_tok(int argc, char *argv[]) {

runner.h

@@ -0,0 +1,13 @@
+#define ALPHA_OFFSET 5
+#define TOK_LEN 3
+#define INVALID_ARG "invalid"
+#define DIFF_ARG "diff"
+#include <string.h>
+#include <std.io>
+#include "lex.yy.c"
+
+extern int line_number, column_number;
+extern char *yytext;
+
+int main(int argc, char* argv);
+char *is_tok(int argc, char* argv);#define ALPHA_OFFSET 5